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Published on: October 18, 2017
Functions of CRK1 Gene of Candida albicans as Studied by Gene Knock-out
Qin Wang1, Song Zhou, Jiang-Ye Chen
1State Key Laboratory of Molecular Biology, Shanghai Institute of Biochemistry, the Chinese Academy of Sciences, Shanghai 200031, China. jychen@sunm.shcnc.ac.cn
Abstract:
In the course of screening MAPK related protein kinase genes from Candida albicans DNA library, a CRK1 (CDC2-related protein kinase) gene was identified. Deletion of the CRK1 gene significantly decreased the growth. rate of cells. CRK1 knock out strains precipitated more rapidly in YPD liquid medium. The CRK1 null mutant stimulated hyphae formation in Lee's liquid medium at pH 4.5 and 25 degrees, which is the medium that maintains the wild type Candida albicans strain in yeast form. These phenomena suggest that CRK1 gene may be involved in cell cycle, flocculation and morphogenesis of Candida albicans. Overexpression of the half length CRK1 gene could induce the invasive growth into agar faintly, the cells that was capable of the invasive growth also changed their cell shapes to long, thin pseudohyphal-like cells, but the full-length CRK1 had only weak effect. The Crk1p might promote the invasive growth or cell elongation through a route different from the MAPK signal transduction pathway.
Insights
The CRK1 gene in Candida albicans is crucial for growth and cell cycle regulation. Its absence promotes hyphae formation and invasive growth, suggesting a role beyond typical MAPK pathways.
Area of Science:
- Mycology
- Molecular Biology
- Cell Biology
Background:
- Candida albicans is an opportunistic fungal pathogen.
- MAPK signaling pathways regulate fungal development and virulence.
- CDC2-related protein kinases (CRKs) are key cell cycle regulators.
Purpose of the Study:
- To identify and characterize novel MAPK-related protein kinase genes in Candida albicans.
- To investigate the function of the identified CRK1 gene in fungal growth, cell cycle, and morphogenesis.
- To explore the role of CRK1 in invasive growth and its relationship with MAPK pathways.
Main Methods:
- Screening of a Candida albicans DNA library for MAPK-related genes.
- Gene deletion and overexpression studies of CRK1.
- Phenotypic analysis of wild-type and mutant strains in various growth media.
- Microscopy to observe cell morphology and invasive growth.
Main Results:
- Identification and characterization of the CRK1 gene.
- CRK1 deletion mutants exhibited reduced growth rates and faster precipitation.
- CRK1 null mutants showed increased hyphae formation under specific conditions.
- Overexpression of a truncated CRK1 induced invasive growth and pseudohyphal formation.
Conclusions:
- The CRK1 gene plays a significant role in regulating Candida albicans growth, cell cycle, and morphogenesis.
- CRK1 influences hyphae formation and invasive growth, potentially through a novel pathway.
- Crk1p may promote invasive growth or cell elongation independently of the canonical MAPK signal transduction pathway.
